kaebee



(No Model.) 2 Sheets-Sheet 1 G. KAEBER.

DENTAL TOOL HOLDER. No. 257,225. Patented May 2,1882.-

@www QM @ya N Q @n 5f wf T WITNEAS'AS'ES (No Modem 2 sheets-#sheen 2. G. KABBBR.

DENTAL TOOL HOLDER. No. 257,225. Patented May 2,1882.

UNITED STATES PATENT OEEICE.

GEORGE KAEBER, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOE TO THE S. S. IHITE DENTAL MANUFACTURING COMPANY, OF SAME PLACE.

DENTAL TOOL-HOLDER.

SPECIFICATION forming part of Letters Patent No. 257,225, dated May 2, 1882.

Application tiled March 13, 1882. (No model.)

To all whom it may concern:

Beit known that I, GEORGE KAEBER, of city and county ot' Philadelphia, in the State of Pennsylvania, have invented certain new `and useful Improvements in Bit or Tool Holders, of which the following` is a specification.

My invention relates to a bit or tool holder having a chuck, the front end of which is socketed and split or divided so as to forni ro spring clamping-jaws compressible upon a bit or tool shank inserted in the socket, and the rear end of which is screw-threaded or connected with a screw-threaded sleeve or portion, so that a screw-nut working upon said 1 5 screw-threads or threaded sleeve may bc turned to draw an inclined surface of the chuck within the mouth of a tubular portion or socket of the handle, and thereby compress the jaws or members of said chuck, Vsaid screw-nut being zo also capable of being turned or adjusted to permit said inclined surface of the chuck to project beyond the socket or mouth of the handle to enable its jaws to spring apart.

The object of my invention more partiell- 2 5 larly is to providey aneat, durable, effective, and convenient bit or tool holder or handle for dentists use, in which the operating bits or tools used by dentists may be readily and interchangeably inserted in the holder or handle and tirmly fastened or clamped therein when in operation as against independent turning or endwise movements.

The subject-matter claimed is particularly recited at the close of the specification.

In the accompanying drawings, which show my improvements embodied in the best way now known to me, Figure 1 is a longitudinal section through a portion of the handle or holder, showing the manner of connecting and 4o manipulating the split-jawed chuck or tool-.

locking device; and Fig. 2 is a similar section. taken on a plane at right angles to that of Fig. 1. Fig. 3 is a tranverse section on the line 3 3 of Figs. l and 2. Fig. 4 is a .partial longitudinal section of a modified formot' holder, and Fig. 5 is a similar section taken on a plane at right angles to that of Fig. 4. Fig. 6 is a transverse section on the line 6 6 of Figs. 4 and 5. Fig. is a longitudinal sec- 5o *tion of still another modified form of holder;

and Fig. 8 is a longitudinal section therethrough, taken on a. plane at right angles to that ot Fig. 7.

The handle proper, A, is preferably cylindrical, and by choice is constructed ot' metal, 55 roughened on its surface to enable a firm grasp to be taken by the hand when holding the handle or holder for operation between the fingers and thumb, somewhat in the manner of holding a pen or pencil, as is customary by 6o dentists when using hand-excavators, hand plugging-tools, &c. Said handle, when adapted for dental purposes, will preferably be of the ordinary size of excavators, hand-pluggers, &c., and is preferably composed of three sections, a, a a2, which, when joined or connected for use, present the appearance, eX- cept upon close inspection, ot' a handle made of a single piece. In Figs. 1, 2, and 3, rI Phave shown one forni 7o ofholder embodying my invention. The front section, u, of the handle is tubular, and in the rear end ot' this tubular section is lirmly fitted the ilattened front end ot' a connecting-piece, c3. Said connectingpiece c3 back of its dat- 75 tened front end is cylindrical preferably for a portion of its length, while the extreme rear` end ot' said connectingpiece is reduced in diameter, and is screw-threaded to enable said rear .end to be rmly screwed into the screw- 8o threaded socket in the front end of the third or main section, a2, of the handle. The second or intermediate section, c', of the handle is tubular, and is tted at its rear end upon the cylindrical portion of the connecting-piece c3, while the front end of said section c is internally threaded to work upon the male threadder to enable the handle section or nut a to '95 engage the said screw-threaded end of the chuck and work thereon. The chuck B is preferably cylindrical and extends through the tubular front section, a, of 'the yhandle. Its

front end, 1)',is socketed, and is also split or roo divided longitudinally to form clamping 4jaws or members, the tendency of which, when free,

is to spring apart a short distance to widen the socket, so as to permit the tool-shank to be readilyinserted in the socket orremoved therefrom, the bit or tool shank being of such a -ment of the chuck B to draw its jaws into the mouth of'the handle-socket to compress them is accomplished by turning or rotating the screw-nut or handle-section a around the connecting-piece ai.

It will be obvious that inasmuch as the chuck cannot turn in the handle, owing to its connection with the sides of the stationary connecting-piece c3, the turning or rotation ot' the section or nut a', with its front end abutting against the rear end of the fronthandle-section, at, will cause the chuck, owing to the screw-connection between it and said section a/,to be moved or drawn inward; and that the incline b2 thereof, upon its entrance into the mouth of the handle-socket, will compress the jaws or members ot the chuck. At the end of the movement of the section or nut a', which compresses the chuck-jaws, the handle-section a2 is screwed up tightly upon the connectingpiece a, against said section or nut, whereby the handle presents the appearance of being made ofl a single piece of metal.

'Io release the jaws or members of the chuck to permit them to spring apart, the section a2 ofthe handle is rst partially unscrewed from the connecting-pico@ af or loosened, and the nut or section a is then rotated or` turned in a direction the reverse of that to compress the a neat, convenient, durable, and firm holderis obtained.

In Figs. 4, 5, and 6 I have shown another embodiment of my improvements. In this example, instead ot' a direct screwconnection between the intermediate handle-section or screw-nut, a', andthe rear end ofthe split-jawed chuck B', as in the form rst described, the rear end of the chuck is considerably reduced to tit a socket in the stationary cylindrical connecting-piece a3, which is irmly connected to or forms apart of the rear end of the iront handle-section, (t, and has a screw-threaded end to enter a corresponding socket in the front end of the rear handle-section, a2, as in The the form before described. Longitudinal slots are formed in the connecting-piece a3 on opposite sides, and these slots intersect the bore of said connecting-piece, as clearly shown in Fig. 5. An externally-threaded sleeve or thimble, c, is fitted upon the cylindrical portion of said connectin g-piece a3, and is fastened to the reduced end ot' the chuck by a transverse pin or rivet, c', which pin or rivet, while connecting the screw-threaded thimble firmly with the chuck, prevents the chuck and thimble from turning, while 'it permits the chuck and thimble to move endwise to compress or release the jaws of the chuck under the action of the screwnut or casing-section af, which works upon said thimble.

'Ihe operation of this form ot' holder will readily be understood from what has been said as to the form shown in Figs. 1, 2, and 3. If desired, the sockets of the chucks or tool-locking devices shown in. Figs. l to 6 may be provided with a lug or pin, t', projecting into the socket to en gage a notch or groove in thc tool-shank. A plain socket, however, will securely fasten and clamp in the chuck plainshank tools.

In Figs. 7 and 8 I have shown still another form of holder embodying my improvements. This form nearly resembles that form of toolholder shown in Figs. 4, 5, and 6. Instead, however, of the spring members of the chuck B being compressed or released at themouth of the handle section c, they are compressed 'and released at the mouth of the tubular connecting-piece a3, which unites the handle-sec tions a a? together, with the turning section or screw-nut c between them. j

The shanks of the tools to be used with the form of holder shown in Figs. 7 and 8 are preferably provided with cross-notches cl, so as to be engaged by pins or projections b3 in the socket of the chuck B, as clearly shown in Fig. 8, while the tool-shank, near its front end, is provided with a cone or tapered surface, d', to lit a corresponding seat in the mouth of the front handle-section, a, By this organization the shank of the operating-tool, when inserted in the chuck-socket and said chuck is manipulated by the screw-section 0,', will not only be securely clamped in the handle or holder, but will have its tapered surface drawn irmly into the corresponding seat in the mouth of the handle-section a, and this will be due to the engagement of the projections b3 in the chuck-socket with the shoulders or notches in the tool-shank and by the backward movement lof the chuck which is to compress its locking members or jaws. .A

The operating-tools shown in the several IIO forms of holders described are cutting-b urrs in-Figs. l and 4, and agrindingorcuttingwheelI in Figs. `7 and 8.

I claim as my inventioul. The combination, substantially as hereinbefore set forth,of a sectional handle, a toolholdin g chuck carried by said handle and movableendwisetherein,and aconnection between section connected with the front section by a said tool-holding chuck and a movable section connecting-piece around which the intermediofsaidhandle,whereby said tool-holdingchuek ate section turns to manipulate said chuck. i is operated to clamp or release a tool by being In testimony whereof I have hereunto sub- `15 5 moved endwise 'in said handle. scribed my name this 10th day of March, A.

2. The combination, substantially as here- D. 1882. inbefore set forth, of the handle composed of a tubular or socketed front section to receive GEORGE KAEBER' a split or springjawed chuck, an intermediate Witnesses:

Io tubularseetion havinganoperating-connection GEORGE B. MORGAN,

with the rear end of said chuck, and a third ELI T. STARR. 

